Corn husking machine



Dec. 26, 1950 COVER 2,535,485

CORN HUSKING MACHINE Filed Feb. 1, 1945 4 Sheets-Sheet 1 Dec. 26, 1950R. COVER CORN nusxmc MACHINE 4 Sheets-Sheet 2 Filed Feb. 1, 1945 w m mw. m N C 1 h M wh Q f nw\ .l QR F M flu RR w Q w I MIN a i m rhl Dec.26, 1950 R. COVER 2,535,485

CORN HUSKING MACHINE Filed Feb. 1, 1945 4 Sheets-Sheet 5 E1Er 5 3% EM L1L1 Elli-E g R. COVER CORN HUSKING MACHINE Dec. 26, 1950 4 Sheets-Sheet 4Filed Feb. 1, 1945 INVENTOR. 50h Carer:

fi hm l 3E0 BY M QZ4M Patented Dec. 26, 1950 UNITED STA-T ES: PATENTOFFICE CORN HUSKING -MACHI-NE' ItalphaGover Westminster, Md,

ApplicationFebruary' 1, 1945; Serial Nc-.57-'5 ,654

' (misc-5).-

6 Claims;

O'sburn on September 26, 1944 In machines of the character stated thereare" provi'ci'edmeans for feedingthe corn ears in the direction oftheirlength butt and rearmost; means for slitting the husks longitudinally,meansfor debuttingthe ears; and means for removing the longitudinallyslit husks'fr'om the debutted ears.

Phepresent invention primarily: seeks to-provide certain new and usefulimprovements in the con structionandthe manner of cooperatively-anranging and driving the husking rolls designed to increase the operatingefiiciency of the rolls,

and to provide forindividual driving of the rolls; adjustment of 'thecooperativerelation of said rolls; and also for interchangeability ofindividual roll parts.

An object of the invention is -to provide in ap paratus of the characterstated 'a pair of huslting rolls and driving means therefor including anindividual gear couple for driving each roll.

' Another object of the invention is to provide' a pair of rolls of thecharacter stated mountedon 'a downward incline and each having aspiral-1 gear adjacent upper end, and a singledriver: shaft disposedtransversely with relation. to said.

rolls and having a spiral gear" thereon meshing.

with each roll gear with 'theportion of each shait gearwhich meshes withthe'respective roll ear moving toward the upper endof the-respectiveroll in a manner for constantly tending to lift said roll in thedirection of its length.

Another object of the invention is to provide a: pair of rolls of thecharacter stated which includey-ieldable surface portions, the surfaceportions on one roll being more yieldable than the opposing portions on.the other roll so that the opposing, surface portions on the cooperatingrolls will yield mnerentially during the. drawing of huskstherethroughandperform the husking function in a:

highly efiicientmannen Another object oftheginvention is to provide'husking rolls of the character stated which there are included smoothshaft cores-,husking.

sleeves secured to metal core sleeves freely slide able over the shafts,and means forconnecting.

the core sleeves in. driving relation with the. shafts without use ofkeys or comparable. non circulal connecting devices likely to renderremoval of; the.-. sleeves difficult because. of rust, corrosion or thelike:

Another: object. ofthe invention is. toprovide.

21. husking rolls or the: character stated eachim eluding two: or more.interchangeable husking.

sleeve andsmetalrcore-sleeve units each driveclutch equipments at therespective'endsi thereofthroughwhichdriving connection with;

the core shaft 'on which; the unit: is mounted (can be effected;

With the above and :otherobjectsinvi'ew'that will hereinafter appean:the naturaof the-invert tion will be moresclearly understoodby'reference: to the followingadetailed description; the appendeedclaims, andithe several views. illustrated in: the. accompanyingdrawing;

In the drawings:

Figure; 1 is. a; sideselevation illustratingvthe in;

vention.

Figure 2. is a horizontal section: taken onthe line 22 on Figure: 1,.theahusking'rolls being; shown. inelevation;

Figure 3 isa. vertical cross section taken on they line 3-3: on Figure;I,

Figure 4 is a vertical cross section, taken on. the line. t-JE on FigureFigure 5; is; an .enlargedzvertical cross section taken...thrcugh the.husking rolls...

Figure-.6: asvie'vv similarto; Figmzefi and thus; trating corn: husks;heingdrawn through the lwskingirolls. i

Figure '7 iSLZaJVlBW: illustratingsthe parts camprising one huskingrolliassembly separated;-

relation, .certainparts; being illustrated tudinal. section.

Figure.- .8. is a. view similar to ure" '1 illustrat long-i mg.the'partsof the. other oricooperatingr huski-ner roll...

Figure. 9. is acetaila perspective viiew-- at he tilter element. whichis disposed; intermediately;

oi the ends stone-. ofithe bushing. r lls-5 Figure 1.0; is: a. detail prSDective view illilfifili'ill'w m a. companion element-.vthiiehcooperates with thaelement: shown in Figure 9:.

Figure: l-l is; detail. perspective-view" illus tratina :one end of. oneof the rollunits or :sece

ti-ons;

Figure 12, is a-detail. perspective. view illustratingz one or the.grooved collars.--

Figure-l3 is; a fragmentary neitspective view illustrating. the; upperslidable bearing for. the:

laterally moving huskineiv r011.

Figure, 1a is. a; fragmentary sentional view" husking, machhie in thehusking; rolls are-' 3 mounted is illustrated and said portion includesa frame structure including a base portion and side wall portions 6extending upwardly from the base portion in parallel spaced relation inthe manner illustrated in Figures 1, 3 and a of the drawings.

It will be apparent by reference to Figures 1 and 2 of the drawings thattwo husking rolls generally designated l and 8 are arranged side by sidein cooperative relation and downwardly inclined as indicated in dottedlines in Figure 1. Each roll includes a core shaft 9 having reduced andthreaded end extensions it and two keyways H which are spaced identicaldistances from the threaded end extremities as illustrated in Figures 7and 8. A plurality of identical roll units is mounted on each shaft, andin this illustration two such units are illustrated as incorporated ineach husking roll. The identical roll units have yieldable externalsurfaces and each comprises a core sleeve 12 and a cover sleeve I3preferably formed of rubber or synthetic rubber but which may compriseany suitable yieldable material. yieldable sleeve is securely attachedto the respective core sleeve 12, as by vulcanizing, and the externalsurface of each yield-able sleeve i3 is equipped with helical ribs I i.The ribs of the cooperating rolls are of opposite hand as illustrated inFigure 2 and are arranged to interfit without contacting in the mannerclearly illustrated in Figure 5. It will also be apparent by referenceto Figure 2 that when the rolls are rotated in the direction illustratedby the arrows on Figure 5 in a manner which will be describedhereinafter, the cooperating roll surfaces will not only cooperate togrip husks between them in the manner illustrated in Figure 6 for thusremoving husks from the corn ears dropped onto the rolls, but will alsotend to feed the ears along the rolls toward the lower end thereof, orto the left as viewed in Figures land 2.

Each end of the core sleeve l2 of each roll unit is provided with aclutch face in the manner clearly illustrated in Figures 7, 8 andll ofthe drawings. These clutch faces preferably are formed by makingstraight through cuts transversely across the end extremities of thecore sleeves so as to leave extended driving lugs with parallel groovestherebetween.

Between the opposed ends of the roll units comprising the husking rollgenerally designated 8 is mounted a tilter element generally designatedI6 and illustrated in detail in Figure 9. This tilter element isprovided with a clutch face ll at each side or end thereof, and which isformed in the manner above described for providing driving lugs withparallel grooves therebetween disposed to interfit with or receive thedriving lugs of the previously described core sleeve clutch face I5.When parts are assembled in the manner illustrated in Figure 2 with thetilter element i6 between the adjacent ends of the roll units and withthe clutch faces I5 and Il interfitting in driving relation, the rollunits and said tilter element Will be assembled as a rigid unit on therespective core shaft 9. It will be apparent by reference to Figures 2,'7, 8, 9 and 11 that said elements are not secured on the respectivecore shaft 9 by use of any keys or non-circular shaft portions whichmight become rusted or corroded in a manner rendering removal of theroll units or tilter elements difficult.

It will be apparent by reference to Figure 9 that the tilter element Itis constructed to in- It is to be understood that each 4 clude twodiametrically oppositely projecting tilter fingers i8 defined by abruptshoulder portions l9 and intervening eccentric peripheral portions 28,the latter having bevelled side faces 2|.

On the husking roll which cooperates with the roll having the tilterelement It, and intermediately of the ends thereof, there is mounted acompanion element 22 having clutch faces 23 at the opposite sides orends thereof as illustrated in Figures 8 and 10 of the drawings. Thiscompanion element is provided with two diametrically oppositely disposedperipheral clearances 2d disposed to receive the tilter fingers I8projecting from the companion element l6 as the rolls rotate incooperative relation as illustrated by the arrows in Figures 4 and 5 ofthe drawings. The companion element 22 also has beveled side wallportions 25 corresponding to or opposing the bevelled surfaces 25 of thetilter element [6 so that the companion elements 22 and 16 will rotatein cooperative relation in position for havin the tilter fingers i8engage and agitate or tilt corn ears moving longitudinally over thehuskin rolls, thereby to provide a corn ear tumbling action which willadditionally assure that the husks will be engaged between the rolls andpulled from the ears thereby in the manner illustrated in Figure 6.

It will be apparent by reference to Figures 2, 7 and 8 of the drawingsthat ring members 26 are mounted over the interfitting clutch surfacesl5 and il so as to cover the cracks between the drivin lugs of theclutch faces and provide a smooth exterior as illustrated in Figure 2.

At the lower end of the apparatus one of the rolls is provided with asecond tilter member generally designated 2?. It will be apparent byreference to Figure 8 that the tilter element is secured on therespective core shaft 9 by a key 28 fitted in a keyway in the tilterelement and in the respective keyway ll of the core shaft, and saidtilter element is the same in general construction as the tilter elementpreviously described and illustrated in Figure 9 except for the factthat it has a clutch face 29 only at that face thereof which opposes thelower end of the respective roll unit. The tilter element 21 cooperateswith a companion element to which s keyed as at 3! on the other coreshaft 3 and said companion element is constructed in the same generalmanner as the previously described element 22 illustrated in Figure 10except for the fact that it has a clutch face 32 only at the facethereof which opposes the lower end of the respective roll unit. A rlng33 encircles the interfitting clutch faces 29, I5 and 32, i5 of theelements 2?, 36 and the roll unit ends for covering the cracks providedby said interfitting clutch faces and providing a smooth external rollsurface as illustrated in Figure 2.

The lower end of the core shaft 9 of the roll generally designated 7 ismounted in a bearing sleeve 35 carried at the inner end of a bearing arm35 which is pivoted as at 36 on a carrier arm 31. See Figures 2 and 4.The carrier arm 31 is in turn pivoted as at 33 on the support member 39which is secured as at 50 to the adjacent frame side wall 6. The stoppin 4! mounted on the support member 39 limits outward swinging movementof the bearing 34 about the center 38, and a spring 42 coiled about saidstop pin engages the carrier arm 3'! and constantly urges the bearing 34and the roll supported therein toward its companion roll. An adjustablescrew 43 carried by the support member 39" engages the bearing arm andlimits movement of the bearing sleeve 34 and the roll'supported thereinin thedirection toward'the-companion husking r011.

At itsupper endeach roll'shaftfl hasa grooved collar 44 pinnedthereon asat 45 by-a pin extend ing through the collar and through a receivin hole46 in said shaft. It will Ice-observed that a hole lfi is'provided ineach end of each shaft 9, and that the keyways ll andsaid holes 45" areso placed that the shafts 9 can be interchangeably mounted; mean bereversed endover end'and mounted without upsetting the organization ormounting of the cooperating-rolls. Each of the grooved-collars isprovided with a clutch face 4 1 for'engagingin driving relation with theadjacent clutch facel5 of the respective upper rollunit, and'a ring 48surrounds each setof interfi'tting clutch face lugs in order to provideatsmooth external surface onev the roll between the grooved collar andthe adjacent rib end ofthe respective roll unit in the manner previouslydescribed and as clearly illustrated in Figures 2', l and 8;

A spiral gear 49is mounted on the upper end ofthe shaft of the huskingroll generally designated l, and a spiral gear 50 is mounted on theupper end of the shaft of the companion husking roll generallydesignated 8 It will be observed by referenceto Figure 2 of -thedrawings thatthe gear 49 isshort and of large diameter and that thegear50 -is relatively'long'and of smaller diameter, and the reasons for thisdimensioning of "the gears and 50 will become apparentasthis'description progresses. Each gear is keyed as at 5| in therespective core shaftkeyway H as illus trated'in Figures? and'i, and itwill be apparent also by reference to these figures and to Figure 2 thatthe-upper end extremity of each of the coreshafts Qhas secured thereon aself-aligning anti-friction bearing '52. Washer and nut equipment 53and'54 are mounted on the threaded end extremities of the shaft, andthose at the upper end extremity serveto secure the selfaligm'ngbearings- 52 in' position on said shafts.

It will be apparent by reference to Figures-2 and 3of the drawihgsthatthe'selfiali'gning bearing -52' of the husking roll generally designated1 is mounted in abearing sleeve 55; and that said sleeve is mounted-onaslide member 56- which is laterally slidable in a slidewayi'l'projecting from ab'earing-member 58. The bearing member 58 is secured'asat 59 to the respective-.irame side wall li, and a compression spring 60coiled-about astop screw Bl adjustably mounted on the mem- 1 ber'58constantly urges the slide member fili -and the-upper end portion of thehusking roll Pto- Ward the companion husking roll: The engagement of thebearing sleeve 55. with the companion sleeve 62' in which the otherhuslaing roll has bearing serves to limit movement of the husking roll7' toward the bushing roll 8; and'the'stop screw 61 limits the amount-ofseparationcf the cooperating husking rolls by contact with the bearingsleeve 55.

The self-aligningbearing- 52 on the upper end extremity of the companionh-llsking roll 8' is slid ably mounted in the bearing sleeve and saidinwardly r from 1 the hearing members which longitudinally-adj ustablysccured as at 6 9 to the lower end oftherespectiveframeside wall 6v SeeFigures 1 and 2';

A driver shaft 10 is' rotatably mounted' trans:- versely of the framingand beneath the husking roll' gears 49 and'5il, and saidshaftrisamounted in bearings ll provided therefor: in'the'previouslymentionedsupporting members 64: and: 58. A sprocket l2 is-secured'on-oneend of the shaft 10- and is driven by chain and sprocket con--.nectionsl3 with a motor: 14'; A short,- small diameter spiral gear 15 ismounted on the driver shaft-imposition for meshing-with the previouslymentioned-long, small diameter 'roll gear: and a long-,relativeli largediameter spiral gear: 16 is mounted on said shaft :in position for mesh'ing with the previously mentioned short: rela; tively large diameterspiral gear- 49. See Figures 2' and 3-. It will be obvious that rotation1mparted tothe shaft 'lll willbe transmitted-to the.

- coreshafts 9- through individual gear couples iii) sleeve is carriedon an arm 63 projecting inward= 15, SB-and It; 49, and by reason ofthekeying of thegears 49 and 50 and the tilter elements 21 and 39 onsaid core shafts; the pinningof the collars 44:. on said shafts,- andthe interen gagement of the several clutch faces 29; I5, I5 I1; IT, l5,i5; 41-, said shafts and all component husking rollparts illustratedin-assembled relation in Figure 2 and in separated relation in Figures'7'and'8 will be'caused to rotatein unison;

A shield plate '1! may be provided over: the intermeshing gear couples,and when provided said plate preferably has a depending slotted skirt m-for engaging the grooved collars in the manner illustrated in dottedlines in Figure l so as-to make it impossible for husks or other debristo infiltrate between the intermeshing gears;

During operation of the husking apparatus-the corn ears dropped onto thehusking rolls '1 and 8' will be rotated and tumbled about thereby whilebeing urged therealong'toward the lower or discharge end by reason ofthe cooperative relationof the roll ribs l'asillustratedinl igure -2.During therolling about of the cornears accentuated by the tilterelements I-6' and 21; the cornhusk's-are certain to begripped betweenthe downwardly rotating opposing surfacesof the rolls in a manner forbeing'efiiciently stripped fromthe ears'inthe' manner illustrated inFigure' 6. The intermeshing spiral gears in combination with the stoppin 43 and the limit contact of the bearing sleeves 55 and 62' maintainthe cooperative relation of the rollsand the helical ribsthereofillustrated in Figure 5, that is the roll ribs are maintainedin-interfitting relation with the yieldable external surfaces of therolls always slightly out of contact; Inthis manner all unnecessarywearing and self-destruction of.

contacting roll portions is'avoided, and yet when" the cornhusks aregripped by the cooperating roll surfaces and drawn therebetween, thehusking operation will be performed in a very eflioient manner.

It will be observed by reference to Figured that the husking rollgenerally designated 8- ismounted at a slightly lower level than is itscompanion roll I. It has been found that this particular relativeplacement of the rolls tends to facilitate rolling about of the cornears as they travel longitudinally over the husking rolls so thatcontact about the whole circumference of each car will be assuredand allpossibility of the husks on any given can not: being en gaged betweenand drawn away by the husking rolls is avoided. Another outstandingfeature of the invention is that of providing cooperating husking rollshaving differential yielding qualities. In other words, the externalsleeve portions it of the respective rolls are formed of rubber,synthetic rubber or other yieldable material s chosen that the externalsurface of one roll will yield more readily than the external surface ofits companion roll, thereby to provide variation in yielding bothradially and tangentially of said rolls. -t is preferred that theexternal surface of the lowermost roll 8 be relatively harder and thatthe external surface of the uppermost roll 7. be relatively softer. Byreason of the provision of this differential yielding feature, whenhusks are drawn between the rolls in the manner illustrated in Figure 6and thus stripped from the ears, engagement of said husks between therolls will differentially deform the engaging surfaces of the rolls, andthe greater deformation of the softer roll surface will cause said rollsurface to engage the husk over a relatively large area and greatlyincrease the frictional contact effective to strip husks from the cars.This differential yielding of the opposing roll surfaces, causinggreater deformation of the softer roll surface and lesser deformation ofthe harder roll surfaces will cause these roll surfaces to engage thehusks over a relatively large differential area and will greatlyincrease the effective husk stripping action of the rolls.

By mounting the driving spiral gears IE and 76 beneath the driven spiralgears Bil and 49 secured on the upper ends of the husking rolls, theupward turning of the surface portions of the gears l5 and it which meshwith the roll gears 53 and d9 constantly tends to lift the husking rollsand thereby counteract the thrust of the weight of the rolls downwardly.The particular construction and arrangement of the meshing spiral gearsand the individual drive provided for the respective huslcing rollsmakes its possible for the rolls to be moved apart against the action ofthe springs and to degree necessary without of disrupting the meshingcontact of said gears. "5y reason of this arrangement of parts, it isalso possible to adjust the husking roll generally designated 8 in thedirection of its length by loosening the bearing securing devices 59 andmoving the self-aligning bearing 52 in its sleeve 62 to any slightdegree which may be necessary or desirable to properly time the rollsand establish the desired coop erative relation of the inter tting rollribs M. I

The particular construction and mounting of the husking rolls hereindisclosed solves a problem commonly encountered in huslring machines,namely that of removing the rolls from their cores after extendedperiods of use. It is quite common for connected parts of these rolls tobecome so rusted or corroded during extended periods of use as to renderdifiicult or impossible desired disassembly, and it frequently happenedthat roll parts which could be salvaged and reused if properlydisassembled have been necessarily discarded. In the construction andarrangement of parts herein disclosed, it is a simple matter to removethe nuts and washers 54, 53, the keys 2% and 5! and the pins whichsecure the collars i l, and thereafter the roll elements illustrated inseparated relation in Figures 7 and 8 can be readily taken apart. Itwill also be apparent that by changing the tilters and their companionelements, and the gears, the rolls as a whole can be interchanged orreversed, inasmuch as the core shafts are exactly the same at both ends.In other words, the rolls are reversible as a whole, end to end; theroll sections or units are reversible end to end; and the roll sectionsor units are reversible on the same roll in their two respectivepositions.

If desired, the clutch face covering rings 30 can be dispensed with andthe yieldable husking surfaces of the rolls extended full length overthe core sleeve clutch faces at the ends of the roll units. In thismanner the yieldable husking surfaces of the rolls are extended so as topresent no non-yielding surfaces intervening the roll units and the endabutments such as the tilter elements or the grooved collars '44. Suchmodified structure is shown in Figure 14 from which it will be apparentthat each end of the core sleeve is is provided with a clutch face andis reduced in diameter as at ill to receive a metal ring 32 which may bewelded or otherwise secured thereon in position for extending over theclutch face as shown. The rubber or other yieldable or deformablecovering sleeve 83 is extended over the ring 82, and it will be apparentthat during assembly of the roll the clutch faces projecting from thetilter elements or the grooved collar will be inserted into the end ofthe rings 82 to interfit with the clutch faces 8!].

In the foregoing description there is disclosed a corn husking apparatuswhich presents outstanding advantages in the way of simplicity ofconstruction, interchangeability of and facility in the mounting anddismounting of component parts, and which operates in a highly eflicientmanner in performing the desired corn husking operation. Said apparatusembodies novel individual roll structures that can be readily assembledand then taken apart after long periods of use without any difhculty dueto rusting or corrosion of engaging parts, means for individuallydriving the rolls and maintaining the desired timing thereof by reasonof the intermeshing of the spiral gear couples and the longitudinaladjust ment of one roll, means for universally-floatably mounting oneroll for movement of separation with relation to the other roll withoutdisrupting the timed relation thereof or the drive couples thereof, andalso means providing for differential yielding or husking surfacedeformation of said rolls. It is to be understood that when said oneroll is adjusted longitudinally the limited amount necessary to correctany out of time relation of the rolls due to wear, careless mounting orabuse, clearance between the cooperating tilter elements always issufficient to permit this adjustment.

While one form of the invention has been shown for purposes ofillustration, it is to be clearly understood that various changes in thedetails of construction and arrangement of parts may be made withoutdeparting from the spirit and scope of the invention as defined in theappended claims.

I claim:

1. In a husking machine, cooperatively opposing longitudinally andhelically ribbed husking rolls disposed side by side, means including aspiral gear drive couple for each roll for causing said rolls to rotatein unison with the ribs thereon interfitting but always in slightlyspaced relation, and means for longitudinally-adjustably mounting onesaid roll.

2. In a husking machine, cooperatively opposing husking rolls disposedside by side, means for yieldably mounting one said roll for movementlaterally with relation to the other of said rolls during passage ofhusks between the rolls, means for longitudinally-adjustably mountingsaid other roll, and drive means for causing the rolls to rotate inunison and including an individual spiral driving gear couple for eachroll.

3. In a husking machine, cooperatively opposing husking rolls disposedside by side on an incline, means for yieldably mounting one said rollfor movement laterally with relation to the other of said rolls duringpassage of husks between the rolls, and drive means for causing the rolsto rotate in unison and including an individual spiral driving gearcouple for each roll having the intermeshing faces of the drivingspirals turning in a direction for constantly tending to move the rollsupwardly in the direction of their length.

4. A husking roll unit comprising a core sleeve having a clutch face atan end extremity thereof, a ring portion extending over said clutchface, and a yieldable husking surface covering over said core sleeve andextending over and to the end extremity of said ring portion.

5. A husking roll comprising, a cylindrical core shaft, a core sleevefreely slidable over and turnable end for end on the shaft and having ayieldable husking sleeve affixed thereon, abutment means secured on theshaft at one end thereof, and abutment means removably secured on theshaft at the other end thereof, said core sleeve having clutch faces atits end extremities, said abutment means at the respective shaft endshaving clutch faces thereon disposed to interfit with the core sleeveclutch faces and connect the core sleeve for rotation with the shaft,and ring members encircling the interfitting clutch face 10 portions andpresenting smooth surfaces externally of the roll.

6. A husking roll comprising, a cylindrical core shaft, abutment meanssecured on the shaft at one end thereof, abutment means secured on theshaft at the other end thereof, and a plurality of core sleeves freelyslidable over the shaft intermediately of the abutment means at therespective shaft ends and turnable end for end on said shaft and eachhaving a yieldable husking sleeve aflixed thereon, at least one saidabutment means having a clutch face in interfitting engagement with aclutch face on the end of the adjacent core sleeve for connecting thelatter for rotation with the shaft, means including interfitting clutchfaces between adjacent ends of the core sleeves for connecting them forrotation together, and a ring member encircling each set of interfittingclutch faces for presenting smooth surfaces externally of the roll.

RALPH COVER.

REEFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 554,061 Gundersen Feb. 4, 1896613,249 Creider Nov. 1, 1898 727,875 Aspinwall May 12, 1903 756,098Connor Mar. 29, 1904 1,461,748 Boyer July 17, 1923 1,627,838 Cover May10, 1927 2,179,579 Morrall et a1 Nov. 14, 1939 2,246,018 Snyder June 17,1941 2,329,768 Kerr Sept. 21, 1943

